Insulator-support.



0. P. MEGAHAN.

INSLULATOR SUPPORT.

APPLIOATION FILED Nov.15, 1913.

1,123,342., Paten@ Jan. 5, 1915,

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OLIVER P. MEGA'HAN, OF WESTERVILLE, ',OHIO.

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Application led November 15,

To all whom t may concern Be it known that I, OLIVER P. MEGAHAN, acitizen of the United States, residing at Vesterville, in the county ofFranklin and State of Ohio, have invented a certain new and usefulImprovement in Insulator-Supports, of which the following is aspecification.

1When cross arms for electric conductors are made entirely of cementthey are costly to transport and are liable to breakage.

The object of the present invention is to provide an improvedconstruction in which the body is made largely of cement but isprimarily made principally of sheet metal so that the cement can beapplied to it at or near the place of use, thereby saving much of thecost of transportation and doing away altogether with the liability tobreakage.

T he invention consists in the general construction stated and also incertain details of construction hereinafter set forth in connection withthe accompanying drawing, which illustrates one embodiment of suchinvention.

1n the said drawings-Figure 1 is an isometric perspective of somewhatmore than one half of a cross arm according to the invention. Fig. 2 isa longitudinal sectional view at one end of the cross arm showingdetails not shown in Fig. 1. Fig. 3 is a perspective like that shown inFig. 1, but looking at the lower side of the arm. Fig. 4 is aperspective view of a socket piece for the insulator holding pins. Fig.5 is a detail section of the metallic shell on the line -a: Fig. 1. v

The metallic shell is cut and pressed out of sheet metal to form a dattop 5, sloping sides 6, 6, curved upturned lips 7, 7, and a boss 8having a vertical face at one or both sides to fit into the groove ofthe pole (not shown) on which the cross arm is to be secured. Formedwith or attached to the shell at each end is a metallic end piece 9having a tongue 10. The structure thus described forms a sort of troughinto which cement concrete 11 can be easily poured and tamped especiallywhen in fluent form, but before supplying the cement I locate U-shapedsocket members 12 of metal each having a square hole 13 to receive asimilarly formed Specification of Letters Patent.

Patented Jan. 5, 1915.

191s. serial No. 801,299.

shoulder 14- on the metallic shank 15 of the glass or porcelaininsulator-holder 16, such an insulator being designed 17. The squaresocket prevents the insulator shank from turning and to prevent thewithdrawal of the shank a nut 18 is threaded onto the shank where itprojects above the cross arm. The upper end of the shank is alsothreaded at 19 to receive a second insulator (not shown). The cement isworked somewhat into the channels formed by the curved lips 7 7, and itengages those lips as well as the tongue 10 binding all the partstogether so that the metal of the shell cannot pull away from the cementor the cement from the shell. The middle boss is provided with a hole 2Ofor fastening the arm to a pole. The shanks of the insulator holders canbe secured in place at the time the concrete is supplied or the socketlocated and the shank holes formed by a suitable former and the shank ofthe insulator holders fitted in afterward. The structure thus formedmakes a durable cross arm with the cement portion thoroughly protectedfrom the disintegrating effects of weather. The shells and shanks can betransported at small cost to distant points, and the cement applied tothe shells at the place of use.

What I claim is:

1. A cross arm for the pole of an electric conductor comprising, incombination, a body of sheet metal formed as an inverted trough withinwardly and upwardly turned edges and with closing pieces for the endsof said body, said end closing pieces having notches engaged by saidinwardly and upwardly turned edges, and a filling of cement concretewhereby the sides are locked from disengagement from the end pieces.

2. A cross arm for the pole of an electric conductor comprising, incombination, a body of sheet metal formed as an inverted trough withinwardly and upwardly turned edges and with pieces closing the ends ofsaidbody, said end closing pieces having notches engaged by saidinwardly and upwardly turned edges and tongues lying within the shell tobe engaged by a cement filling, and the cement filling whereby the endpiece is locked from movement in any direction, substantially asdescribed.

3. A cross arm for the pole of an electric conductor comprising, incombination, a turned edges whereby the sid bodyfof sheet metal formedas an lnverted from disengagement from said end, and a trough Withinwardly and upwardly @urged Vfilling; of concrete oernent yin said bodd y. edges, a closing piece for an end of said OLIVER P. MEGAHAN. 5 bodyconnected with one of the Walls of said Witnesses:

body, said closing piece having notches en- BENJAMIN FINCKEL, gaged bysaid inwardly and upwardly GEO. M. FINCKEL.

oplel of this patent may be obtained for ve cen/tseach, by

addressing the Commissioner of Plvtenfl, Washington, D. Q."

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